<!DOCTYPE html>
<html>
<head>
    <style>
        span {
            display: inline-block;
            min-width: 12px;
            min-height: 12px;
            background-image: url("../assets/2x2checkerboard.png");
            background-size: calc(max(0.75em, 12px));
        }
    </style>
</head>
<body><span></span><img src="../assets/2x2checkerboard.png">
